Media bed mechanical sand filtration systems comprise gravity flow, pressure and moving bed continuous backwash filtration systems. In all cases the most common mechanical filtration media is quartz silica sand. The quality of quartz sand is a variable depending upon the country and the location of the deposit.

There is a requirement for a consistent quality of filter media for all industries using media bed filtration in order to standardise and optimise the filtration process. This aspect becomes more important for filters that have a pressure gradient across the bed such as horizontal filters, or filters that have not been installed on a perfectly level base. The performance of seven different types of filtration media were physically evaluated by IFTS (1) one of the leading independent accredited laboratories in Europe for the evaluation of products used in the water industry.

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